No longer working for the government, Chuck enlists Morgan's help to search for his mother. Sarah and Casey must infiltrate a mysterious Russian company, and Ellie has important news to tell the family.

As the team tracks down a high-tech weapon in Milan during Fashion Week, Chuck discovers some issues in his relationship with Sarah. Morgan uncovers a flaw in Buy More's security, and Casey tries to acclimate himself to living in Burbank.

Two former enemies set their sights on Chuck and Sarah when they escape from custody during a prisoner transfer. Morgan receives a surprise from Big Mike.

Chuck and Sarah work on their relationship as they accompany Ellie and Devon to Costa Gravas to meet Premier Alejandro Goya. Casey has to contend with Morgan's interest in his daughter.

Members of Casey's old combat unit attempt to find him. Chuck continues his search for his mother, and Morgan is hesitant to tell Casey a big secret.

Chuck, Sarah, Casey, and Morgan must stop a scientist from releasing a nightmare-inducing toxin. Damaging information regarding Chuck's mother is discovered. Devon's mother pays a visit. Jeff and Lester deck out the Buy More for Halloween.

After getting into a fight with Sarah, Chuck goes on a solo mission and locates his mother's spy handler and a Russian agent. Ellie investigates her family's history.

In order to repair his status as an agent and his relationship with Sarah, Chuck agrees to go on a dangerous mission with an eccentric partner. Morgan and Casey must stop Jeff and Lester from knowing the true identity of Greta at the store.

While hiding out in Southeast Asia from an international agent determined to locate the Intersect, Sarah goes on a rogue mission. Ellie and Awesome work to uncover a family secret.

Things are turned upside-down the day after Thanksgiving when Chuck's mother drops by along with Alexei Volkoff. Morgan must deal with Jeff and Lester during the Black Friday sale at the Buy More.

Chuck and Sarah try to combine a romantic French getaway with a mission to find a specialized microchip. Lester asks Big Mike for romantic advice.

Chuck becomes worried when Sarah goes to extreme measures to help his mother take down Alexei Volkoff. Ellie and Devon have trouble deciding the name of their new baby.

Chuck and Morgan embark on a mission to take down Alexei Volkoff, while Sarah tries to rescue Chuck's mom. Casey tries to get to know his daughter better, and Ellie eases Devon into fatherhood.

Chuck, Sarah, and Casey must travel to Morocco to rescue suave former agent Roan Montgomery. Morgan meet's Alex's mother, and Mary Bartowski acclimates herself to civilian life and spends time with her new granddaughter.

Chuck gets more than he bargained for when he reunites Sarah with her former team. Morgan's ex-girlfriend is back in town.

Chuck and Sarah's Valentine's Day is put on hold when they must travel to England to protect an oil baron's daughter. A mysterious woman makes Casey a compelling offer. Ellie and Devon receive parenting help from an unusual source.

Vivian joins the team on a mission. Morgan searches for a new roommate.

Chuck worries about his job as new agents are brought in. Chuck and Sarah suspect Casey is going on rogue missions. Morgan tries to make the best of things with his new roommate.

Chuck's leadership skills are tested when someone is found murdered in Castle. Ellie picks up a hobby that worries Awesome, and Morgan is stuck in the middle when the Buy Morons take on the neighboring Large Mart.

When the CIA targets Vivian Volkoff for assassination, Chuck turns to an unusual ally to protect her: Vivian's father, Alexei. Ellie suspects her mother doesn't want her to find out about her father's past.

Chuck and Sarah call in her con-artist father, Jack Burton, to help recover the wedding funds they lost. Morgan talks Casey into meeting with Alex's mother.

Devon's plans for Chuck's bachelor party go awry while unexpected visitors crash Sarah's bachelorette party. Ellie discovers an important secret about her father's research.

Ellie steps in to organize Chuck and Sarah's rehearsal dinner while they attempt to locate Chuck's mother and Morgan encounters Vivian Volkoff.

When Chuck and Sarah enlist the help of Alexei Volkoff to stop his daughter from destroying their wedding, the CIA sends one of its best agents after them.